ListScoller上下滑动

package com.example.listscoller;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ListView listview;
    ArrayAdapter<Bean> adapter;
    List<Bean> list ;
    int progress=0;
    MyAdapter myAdapter ;
    ProgressDialog progressDialog;


    public Handler handler = new Handler(){
        public void handleMessage(android.os.Message msg) {

            if(msg.what==0){
                myAdapter.notifyDataSetChanged();

            }
        };

    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        //查找控件
        listview = (ListView) findViewById(R.id.list_view);

        //打气
        View contentView = View.inflate(this, R.layout.jingzhi_layout, null);

        //添加到底部
        listview.addFooterView(contentView);

        listview.setOnScrollListener(new AbsListView.OnScrollListener() {

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
                // TODO Auto-generated method stub
                if(scrollState== AbsListView.OnScrollListener.SCROLL_STATE_IDLE&&listview.getLastVisiblePosition()==list.size());

                list.add(new Bean("哈哈", R.mipmap.ic_launcher));
                list.add(new Bean("哈哈", R.mipmap.ic_launcher));
                list.add(new Bean("66",  R.mipmap.ic_launcher));
                list.add(new Bean("哈哈",  R.mipmap.ic_launcher));
                list.add(new Bean("77",  R.mipmap.ic_launcher));
                list.add(new Bean("哈哈",  R.mipmap.ic_launcher));
                getData();
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem,
                                 int visibleItemCount, int totalItemCount) {
                // TODO Auto-generated method stub

            }
        });


        //先建list
        list = new ArrayList<Bean>();
        //数据  设置适配器
        getData();

        listview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

            private AlertDialog.Builder builder;

            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view,
                                           final int position, long id) {
                // TODO Auto-generated method stub

                builder = new AlertDialog.Builder(MainActivity.this);
                builder.setIcon(R.mipmap.ic_launcher);
                builder.setTitle("提示");
                builder.setMessage("确认删除吗");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // TODO Auto-generated method stub
                        progressDialog = new ProgressDialog(MainActivity.this);
                        progressDialog.setIcon(R.mipmap.ic_launcher);
                        progressDialog.setTitle("警示");
                        progressDialog.setMessage("正在删除");
                        progressDialog.setProgressStyle(progressDialog.STYLE_HORIZONTAL);
                        progressDialog.show();
                        new Thread(){
                            public void run() {
                                while(true){
                                    if(progress<100){

                                        progress++;
                                        progressDialog.setProgress(progress);

                                        try {
                                            sleep(50);
                                        } catch (InterruptedException e) {
                                            // TODO Auto-generated catch block
                                            e.printStackTrace();
                                        }
                                    }else{
                                        list.remove(position);
                                        handler.sendEmptyMessage(0);
                                        progressDialog.dismiss();
                                        progress=0;
                                        break;
                                    }

                                }

                            };

                        }.start();
                    }
                });
                builder.setNegativeButton("取消", null);

                builder.show();
                return false;
            }
        });

    }

    private void getData() {
        // TODO Auto-generated method stub
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));
        list.add(new Bean("哈哈", R.mipmap.ic_launcher));

        if(adapter==null){

            myAdapter = new MyAdapter(list,MainActivity.this);
            listview.setAdapter(myAdapter);

        }else{

            //刷新适配器
            adapter.notifyDataSetChanged();
        }
    }
}